<template>
  <div id="index">
    <div class="title-wrapper">
      <div class="title-box">
        <div class="title-nav">尊敬的住户：</div>
        <div class="title-opoen" v-show="!isopen" @click="open">点击展开 <img src="../../../../static/img/down.png"></div>
        <div class="title-opoen" v-show="isopen" @click="open">点击关闭 <img src="../../../../static/img/up.png"></div>
      </div>
      <div class="title-text" v-show="isopen">
        预定餐品请确认预订成功后在离开，稍后我们会来电确认请的预定。部分餐品限量每人一份，餐品均需60分钟准备，请在供餐结束前60分钟完成订餐，谢谢。
      </div>
    </div>
    <div class="goods-up" ref="goodsTop">
      <div class="menu-wrapper" ref="menuWrapper">
        <ul>
          <li v-for="(item,index) in goods" :key="index" class="menu-item" :class="{'current':currentIndex===index}" @click="selectMenu(index,$event)" ref="menuList">
            <span class="text border-1px">
              <span v-show="item.type>0"></span>{{item.typename}}
            </span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper" ref="foodsWrapper">
        <ul>
          <li v-for="item in goods" :key="item.id" class="food-list" ref="foodList">
            <h1 class="title">{{item.typename}}</h1>
            <ul>
              <li v-for="food in item.goodEntities" :key="food.id" class="food-item border-1px">
                <div class="icon">
                  <img width="57" height="57" :src="food.imgurl">
                </div>
                <div class="content">
                  <h2 class="name">{{food.name}}</h2>
                  <p class="desc">{{food.describe}}</p>
                  <!-- <div class="extra">
                      <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                    </div> -->
                  <div class="price">
                    <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                  </div>
                  <div class="cartcontrol-wrapper">
                    <cartcontrol @add="addFood" :food="food"></cartcontrol>
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <shopcart ref="shopcart" :selectFoods="selectFoods"></shopcart>
    </div>
    <div class="golist" @click="golist()">
      <img src="../../../../static/img/dd.png">
    </div>
  </div>
</template>

<script type="text/ecmascript-6">
import BScroll from 'better-scroll'
import shopcart from '@/components/Order/index/shopcart'
import cartcontrol from '@/components/Order/index/cartcontrol'
import apis from '../../../../static/js/apis'
import { querystring } from 'vux'
export default {
  data () {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectedFood: {},
      isopen: false,
      useridbbj: {},
      userid: ''
    }
  },
  computed: {
    currentIndex () {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i]
        let height2 = this.listHeight[i + 1]
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          this._followScroll(i)
          return i
        }
      }
      return 0
    },
    selectFoods () {
      let foods = []
      this.goods.forEach((good) => {
        good.goodEntities.forEach((food) => {
          if (food.count) {
            foods.push(food)
          }
        })
      })
      return foods
    }
  },
  created () {
    this.useridobj = querystring.parse()
    // console.log(this.useridobj)
    this.userid = this.useridobj.wxuserinfoid
    localStorage.setItem('userId', this.userid)
    this.order()
  },
  methods: {
    order () {
      this.$axios
        .post(
          apis + '/shenglian-fast/app/weixinapp/goodslist'
        )
        .then(response => {
          if (response.data.msg === 'success') {
            let data = response.data
            this.goods = data.typelist
            this.$nextTick(() => {
              this._initScroll()
              this._calculateHeight()
            })
          }
        })
        .catch(error => {
          console.log(error)
        })
    },
    golist () {
      this.$router.push({
        path: '/list'
      })
    },
    open () {
      this.isopen = !this.isopen
      if (this.isopen === true) {
        this.$refs.goodsTop.className = 'goods-up goods-down'
      } else {
        this.$refs.goodsTop.className = 'goods-up'
      }
    },
    selectMenu (index, event) {
      if (!event._constructed) {
        return
      }
      let foodList = this.$refs.foodList
      let el = foodList[index]
      this.foodsScroll.scrollToElement(el, 300)
    },
    selectFood (food, event) {
      if (!event._constructed) {
        return
      }
      this.selectedFood = food
      this.$refs.food.show()
    },
    addFood (target) {
      this._drop(target)
    },
    _drop (target) {
      // 体验优化,异步执行下落动画
      this.$nextTick(() => {
        this.$refs.shopcart.drop(target)
      })
    },
    _initScroll () {
      this.meunScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      })
      this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
        click: true,
        probeType: 3
      })
      this.foodsScroll.on('scroll', (pos) => {
        // 判断滑动方向，避免下拉时分类高亮错误（如第一分类商品数量为1时，下拉使得第二分类高亮）
        if (pos.y <= 0) {
          this.scrollY = Math.abs(Math.round(pos.y))
        }
      })
    },
    _calculateHeight () {
      let foodList = this.$refs.foodList
      let height = 0
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        this.listHeight.push(height)
      }
    },
    _followScroll (index) {
      let menuList = this.$refs.menuList
      let el = menuList[index]
      this.meunScroll.scrollToElement(el, 300, 0, -100)
    }
  },
  components: {
    shopcart,
    cartcontrol,
    apis
  }
}
</script>

<style lang="stylus" rel="stylesheet/stylus" scoped>
  @import "../../../common/stylus/mixin.styl"
  .title-wrapper
    width 100%
    overflow hidden
    background #f0f8f8
    box-sizing border-box
    .title-text
      width 100%
      box-sizing border-box
      padding 0 23px 20px 23px
      font-size 12px
      color #333
      line-height 16px
      text-indent 25px
    .title-box
      box-sizing border-box
      display flex
      width 100%
      padding 0 23px
      font-size 12px
      color #333
      line-height 44px
      .title-nav
        flex 1
      .title-opoen
        flex 1
        color #fb8c00
        text-align right
        img
          width 14px
          height 12px
  .goods-up
    display: flex
    position: absolute
    top: 44px
    bottom: 46px
    width: 100%
    overflow: hidden
    transition all .5s
    .menu-wrapper
      flex: 0 0 100px
      width: 100px
      background: #f5f5f5
      .menu-item
        display: table
        height: 75px
        // width: 66px
        padding: 0 17px
        line-height: 14px
        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          font-weight: 700
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
        .text
          display: table-cell
          width: 66px
          vertical-align: middle
          border-1px(rgba(7, 17, 27, 0.1))
          font-size: 12px
    .foods-wrapper
      flex: 1
      background:#fff
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7
      .food-item
        display: flex
        margin: 18px
        padding: 10px 0
        border-1px(rgba(7, 17, 27, 0.1))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            margin: 2px 0 8px 0
            height: 14px
            line-height: 14px
            font-size: 14px
            color: rgb(7, 17, 27)
          .desc, .extra
            line-height: 10px
            font-size: 10px
            color: rgb(147, 153, 159)
          .desc
            line-height: 12px
            margin-bottom: 8px
          .extra
            .count
              margin-right: 12px
          .price
            font-weight: 700
            line-height: 24px
            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 12px
   .goods-down
     top 110px
     transition all .5s
    .golist
      position fixed
      right 0
      bottom 10%
      width 70px
      height 85px
      overflow hidden
      img
        width 100%
        height 100%
</style>
